If you're trying to do this on a Mac, this is on topic for this site as well as Super User.
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Nathan GreensteinDec 3 '11 at 19:39

This is a very generic question, and it lends itself to a rather generic description of the tool available. If you have a more specific problem, as you suggest in your comment on the answer by bmike, you might do better asking that question (as in "I am running app X that downloads video files from a server, caches them in memory, and then plays them. How do I save these files to disk?").
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Daniel♦Apr 5 '12 at 13:46

1 Answer
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Run sysdiagnose on the process ID and look over the leaks and allmemory commands to get a feel for the syntax. You will need to know a lot about the data structures for this to be feasible. With that, you can drop the program into the debugger and dump the required data structures to screen.

I have a very little idea of what you're talking about :-) I'm not programmer. I run 10.6.8. I know that the app is caching video files that it's getting from a server, I know what part of the filename could be. I don't know what sysdiagnose is (google didn't help).
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user2113Dec 3 '11 at 20:00

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You probably want some stream capture software instead of some very technical breakdown of what is in your ram.
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hobsDec 3 '11 at 21:00

@hobs having to capture each stream is what I want to avoid. Right now I found the files and I'm trying to play them, they are qtch
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user2113Dec 3 '11 at 21:52

Hibernate your Mac, and then play with the huge file it produces after waking?
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stuffe♦Feb 1 '12 at 22:10